What flowers and plants need the least water?
Your best bet are plants native to where you live. They are well adapted to the climate and rainfall that you receive. Look for a local nursery that specializes in plants from your area. Those native plants will thrive and will need no extra water than just the rain you normally get. Some plants that are normally considered drought tolerant may expect water during different times of the year than your climate normally receives rain. For example many plants from California are very drought resistant because normally California gets no rain whatsoever between late May through September. That means California plants expect to be able to survive for four months, the hottest of the year, with no water. However if you plant a California plant in an area that gets lots of summer water and a dry winter they will not survive. You will not have to worry about introducing potentially invasive species. Also you will be doing your part to help your native plants survive.
